>>46703155I assume Falkner's still intended as the 1st Gym Leader;
Hoothoot Lv12
> GSC - Peck, Growl, Tackle, Mud-Slap> HGSS - Peck, Hypnosis, Roost, TackleMurkrow Lv14
> GSC - Peck, Pursuit, Mud-Slap> HGSS - Peck, Pursuit, Astonish, RoostI always view Falkner as being a bit of a proud and overconfident character, and so falls more on the "You think you can beat me" sort of side of Gym Leaders as opposed to the "I'm eager for your challenge" sort of Gym Leaders, as such I think Murkrow fits well as his ace plus it is a decently bulky Pokemon for that point in the game and introduces the Dark-Type right off the bat.
As for Post-Game in HGSS;
Noctowl Lv54 - Extrasensory, Air Slash, Roost, Uproar
Farfetch'd Lv54 - Slash, Swords Dance, Aerial Ace, Leaf Blade
Swellow Lv55 - Aerial Ace, Steel Wing, Double Team, Roost
Fearow Lv55 - Drill Peck, Swagger, Mirror Move, Secret Power
Staraptor Lv56 - Brave Bird, Close Combat, Whirlwind, Quick Attack
Honchkrow Lv57 - Night Slash, Brave Bird, Roost, Heat Wave